<!-- 父级页面:除登录页以外所有页面的共有头部和左侧侧边栏在这里写 -->
<template>
  <!-- 效果:父容器使用弹性布局,两个子元素横置,左侧块菜单栏折叠时64px,不折叠时208px,右侧块占剩余所有空间 -->
  <div style="display: flex;">
    <div :style="{width:(isCollapse ? '64px' : '208px')}">
      <el-menu
          background-color="#3c82f5"
          style="width:100%;height:100vh;"
          text-color="#fff"
          active-text-color="#ff0"
          unique-opened
          router
          :collapse="isCollapse"
          :collapse-transition="false"
      >
        <!-- 左侧菜单栏顶部条  -->
        <el-row style="padding-top: 10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 7px;">
            <!-- el-avatar是el的头像组件,可以把图片切成圆形 -->
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <span style="color:#fff;font-weight:bold;position:relative;top:8px;left:2px;">
              智慧车辆
            </span>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;"><User/></el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size:21px;"><Van/></el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">车辆列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size:21px;"><Location/></el-icon>
            <span>电子围栏</span>
          </template>
          <el-menu-item index="/geofence">围栏管理</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size:21px;"><Place/></el-icon>
            <span>调度管理</span>
          </template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size:21px;"><MessageBox/></el-icon>
            <span>数据字典</span>
          </template>
          <el-menu-item index="/dict">字典管理</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!-- 右侧顶部条 -->
      <el-header style="padding-top:22px;height:10vh;background-color:#fff;">
        <!-- 折叠按钮 + 退出登录  -->
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size:20px;" @click="changeCollapse"><Expand/></el-icon>
          </el-col>
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position:absolute;right:20px;">
              <span style="font-size:19px;font-weight: bold;">
                {{user.username}}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!-- 面包屑导航  -->
        <el-breadcrumb separator="/" style="position:relative;top:20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
<!--          <el-breadcrumb-item>用户管理</el-breadcrumb-item>-->
<!--          <el-breadcrumb-item>用户列表</el-breadcrumb-item>-->
        </el-breadcrumb>
      </el-header>
      <!-- 右侧的主题内容:也是除顶部条与面包屑之外的可变区域,可变内容在各个子页面中写! -->
      <el-main style="height:90vh;padding:0;overflow-y: auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";

//定义变量控制左侧菜单栏是否折叠
const isCollapse = ref(false);
//定义修改菜单栏是否折叠的方法
const changeCollapse = () => {
  isCollapse.value = !isCollapse.value;
}
//获取当前登录的用户数据
const user = ref(getUser());
//定义退出登录的方法
const logout = ()=>{
  if(confirm('您确认要退出登录吗?')){
    //退出时要:清空本地存储+跳转至登录页+清除已取出的用户数据
    localStorage.removeItem('user');
    window.location.href = '/login';
    user.value = '';
  }
}
//定义数组用来维护当前面包屑导航显示的值
const breadcrumb = ref();
//定义对象用来维护路由path与面包屑数组值的对应关系
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['电子围栏','围栏管理'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/geofenceMap':['围栏管理','围栏新增'],
  '/dict':['数据字典','字典管理'],
  '/dictOption':['字典管理','字典项'],
};
//useRoute()是vue路由器提供的一个API,用来访问当前组件的路由状态数据,获取的是当前路由对象
const route = useRoute();

//定义方法,每次路由发生变化时,立即触发
const updateBreadcrumb = (route)=>{
  //取出当前路由的path值
  const path = route.path;
  //从map对象中取出此path对应的面包屑数组值
  breadcrumb.value = map[path];
}
//一进到页面立即执行的方法onMounted()
onMounted(()=>{
  updateBreadcrumb(route);
})
const router = useRouter();
//监听路由的变化,如果发生了改变
router.beforeEach((to, from, next)=>{
  //立即更新面包屑的值
  updateBreadcrumb(to);
  //再进行路由跳转
  next();
})


</script>